Cannot choose image from computer to add to WP Content.

Hi there,
I am trying to load images directly from my PC, so that they go to my WP/Content file. This should be simple enough, but when I go to select ‘Add Media’ then ‘Add An Image’, it won’t allow me to Browse or Upload. The Search Bar will appear for a split second, only to be instantly replaced by a ‘Choose Files To Upload’ Button, which doesn’t work. I have tried snatching the ‘Browse’Button when it appears for a second but that doesn’t work. I have tried this in both Mozilla and Safari and the same probloem presents itself. I have removed any recent plugings and nothing has changed. Please help me before I chew threw the desk in utter despair. >_< Many thanks. ZH